21466755 has 16 divisors (see below), whose sum is σ = 38163360. Its totient is φ = 11448864.

The previous prime is 21466747. The next prime is 21466769. The reversal of 21466755 is 55766412.

It is a happy number.

It is not a de Polignac number, because 21466755 - 2³ = 21466747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79372 + ... + 79641.

It is an arithmetic number, because the mean of its divisors is an integer number (2385210).

Almost surely, 2^21466755 is an apocalyptic number.

21466755 is a deficient number, since it is larger than the sum of its proper divisors (16696605).

21466755 is a wasteful number, since it uses less digits than its factorization.

21466755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159027 (or 159021 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 21466755 is about 4633.2229603161. Note that the first 3 decimals coincide. The cubic root of 21466755 is about 277.9214924183.

The spelling of 21466755 in words is "twenty-one million, four hundred sixty-six thousand, seven hundred fifty-five".